Transaction type
| type | code | remark |
| –––––––––– | —————– | ———————————— |
| DEPOSIT | 1u32 | Deposit transaction. |
| WITHDRAW | 2u32 | Withdraw transaction. |
| TRANSFER | 3u32 | Transfer transaction. |
| CREATE_MAIN_SECRET | 4u32 | Create main secret transaction. |
| DESTROY_MAIN_SECRET | 5u32 | Destroy main secret transaction. |
| CREATE_API_SECRET | 6u32 | Create api secret transaction. |
| DESTROY_API_SECRET | 7u32 | Destroy api secret transaction. |
| SUBMIT_SPOT_ORDER | 8u32 | Submit spot order. |